Invisible UV ink for printers . Black light reactive UV fluorescent ink for micro piezo printers . 6 Colors invisible ink set: cyan,light cyan, magenta, light magenta, yellow .white (replaces black) .Encapsulated dye ink,invisible in daylight. Inks are invisible and require UV light in order to be seen .You can make artwork for your par?es, dorm rooms, as secret messages, or even to print on a variety of substrates for identification.